A Permian disturbance of K-Ar radiometric ages in New England: Its occurrence and cause
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Abstract
Approximately 200 K-Ar mineral and whole rock ages from New England, half of which are previously unpublished, are used to delineate an area of Permian thermal disturbance. The disturbed area, as outlined by K-Ar mica ages, forms a north-northeast-trending belt 60–80 mi wide that extends from the coast of Long Island Sound in southern Connecticut to southwestern Maine, where it terminates against rocks displaying older radiometric ages. Several possible mechanisms that may have affected the radio-metric systems of pre-existing rocks are examined: (1) contact metamorphism related to contemporaneous igneous activity, (2) alteration associated with major faulting, (3) regional metamorphism in late Paleozoic time, and (4) burial followed by uplift and erosion. Evidence is given that each of these mechanisms was operative locally, especially in the southern portion of the belt. The general lack of late Paleozoic tectonism in New Hampshire and Maine suggests that only burial is a likely cause of the disturbance there.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A Permian disturbance of K-Ar radiometric ages in New England: Its occurrence and cause |
| Series title | Bulletin of the Geological Society of America |
| DOI | 10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2 |
| Volume | 81 |
| Issue | 11 |
| Year Published | 1970 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 15 p. |
| First page | 3359 |
| Last page | 3373 |
| Country | United States |
| State | Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island |
| County | Barnstable County, Bristol County, Coos County, Cumberland County, Essex County, Franklin County, Grafton County, Hampden County, Hartford County, Jackman County, Kennebec County, Knox County, Lincoln County, Litchfield County, Middlesex County, New Haven County, Oxford County, Plymouth County, Providence County, Rockingham County, Somerset County, Strafford County, Sullivan County, Waldo County, Worcester County, York County |
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